fix: mark only leading string expressions as directives

[armano2]

This PR fixes detection of directives:

• all leading string expressions in block should be marked as such unless there is expression of different type in between them
• directives does not have to be unique

[codecov[bot]]

Codecov Report

Merging #126 into master will not change coverage. The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #126   +/-   ##
=======================================
  Coverage   93.71%   93.71%           
=======================================
  Files           8        8           
  Lines        1401     1401           
  Branches      325      325           
=======================================
  Hits         1313     1313           
  Misses         49       49           
  Partials       39       39

Impacted Files	Coverage Δ
src/convert.ts	94.46% <100%> (ø)	:arrow_up:

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[armano2]

ohh, i see there is one more issue here

[JamesHenry]

@armano2 Please could you email me when you get chance: typescript-eslint@jameshenry.blog

[armano2]

can't we just go on slack or discord, i don't like sharing my emails with strangers xd

[JamesHenry]

(redacted link) - we are both on spectrum now